Ten years have passed since the most serious crisis of mankind occurred. The story takes place in the huge academic city — Academia — symbol of the recovery.

The main character, Shiratori Kuu, is a high school girl, who enjoys school life, but thinks her routine life is empty. She sometimes has a recurring dream though, a dream in which she encounters a prince. And while all the students are preparing for the school festival, the prince from her dream appears in reality. And just like in her dream, the prince — Ayanokouji Kyoushirou — asks her: “Come with me…”